JPH06190874A - Method and die for molding deliver container for bar cosmetic and the like - Google Patents

Abstract

PURPOSE:To manufacture a cylindrical body equipped with a short frame top edge having volumed and highly graded look by compressing a diameter of a second slide core and a diameter of a first slide core through the second slide core by a pressure element with pulling out of core, and displacing frames for molding undercuts to an inner part of an inside diameter of the cylindrical body. CONSTITUTION:With movement of a taper 11, wedging work for a first slide core 8 is weakened, so that four second slide cores 9 are pushed out in the direction of inside diameter by pressing force of springs 10 and four first slide cores 8 are also pushed in the direction of inside diameter. Thus, frames 80 and 90 for forming undercuts of legs 8a and 9b are disassembled from their annular states so as to be narrower and the frames 80 and 90 deviate to an inner part from the inside face of cylindrical part of a cylindrical product A so as to be positioned in a hole 50 of a mount plate. When a fixed side retainer plate 504 is separated from a stopper plate 505, the cylindrical product A is left in a state embedded in a periphery of an inner core 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding method and a molding die for a feeding container for stick-shaped cosmetics or the like having an undercut all around.

[0002]

2. Description of the Related Art A delivery container for stick-shaped cosmetics, for example, a lipstick container, has a middle plate to which the lipstick is attached and a vertical groove for penetrating a projection provided on the outer periphery of the inner plate and having 180-degree symmetry. It consists of an inner cylinder, an outer cylinder (guide cylinder) that has a spiral groove that guides the protrusion that penetrates the vertical groove, and a cap that is attached to and detached from the outer cylinder.The inner cylinder is usually called a "hama" at the lower end. The rotary operation parts are integrally molded or separately molded and fixed. By the way, the outer cylinder is a portion that is seen by the user when the cap is removed, and occupies a large weight in terms of the appearance, appearance and commercial value of the container.

As the outer cylinder, a plastic cylinder has been generally used in the past, but it cannot be denied that the outer cylinder is poor in quality. As a countermeasure against this, there is known one in which a metal cylinder C is externally fitted to a plastic outer cylinder A'as shown in FIG. In this case, the metal cylinder is formed with a short brim-shaped top edge portion D protruding inward in the radial direction by deep drawing, and a volume feeling is created by the short brim-shaped top edge portion D, and the top end surface E of the outer cylinder A ′ is formed. Since it can be covered so as not to be seen from above, the appearance and appearance can be made excellent, and a high-class feeling can be exhibited. However, since a metal cylinder is used as a separate part, it is inevitable that the manufacturing cost and the assembling cost will increase and the cost will increase significantly.

As a countermeasure against this, it is preferable that the outer cylinder itself has a short brim-shaped top edge portion. However, in this type of container, the inner cylinder and the outer cylinder are rotatable relative to each other, and at least one longitudinal groove of the inner cylinder reaches the top edge, and a thick outward flange is provided on the top edge. The outward flange is locked on the step formed on the inner surface of the outer cylinder top. Therefore, in order to obtain the short brim-shaped top edge portion in the plastic outer cylinder as in the case of the metal cylinder, it is necessary to form the entire circumference undercut portion, and it becomes impossible to perform die cutting after molding. For this reason, conventionally, in the case of a plastic, as shown in FIG. 26, the outer cylinder A ′ is inevitably a straight one in which the top is not bent inward, and vapor deposition or stamping is applied to the peripheral surface for improving the appearance. Even if it was applied, the plastic material colors of the top end surface E of the outer cylinder A ′ and the entire top surface of the inner cylinder F were visually observed from the top as they were, and it was not possible to reveal a volume feeling and a high-class feeling.

The present invention was devised in order to solve the above-mentioned problems, and a first object thereof is to make a volume feeling and a high-class feeling having a short brim-shaped top edge portion while being made of all plastics. It is to provide a method for forming a dispensing container for stick-shaped cosmetics or the like with an undercut all around, which can easily manufacture a tubular body provided with. A second object of the present invention is to provide a compact and relatively simple mold suitable for carrying out the method.

[0006]

In order to achieve the first object, the present invention has a collar for undercut molding on the outer peripheral side in the region adjacent to the cavity mold for forming the inside and outside of the cylinder and the inner core. As with the plurality of first slide cores, a plurality of second slide cores having an undercut forming collar on the outer peripheral side are alternately arranged in the circumferential direction, and the first slide cores are located on the inner diameter side. The core is arranged so as to be always in contact with both sides of the outer diameter portion of the first slide core by the urging of the pressure element from the back, and the upper core is inserted into the first slide core to resist the pressure force of the pressure element. Then, the diameters of the first slide core and the second slide core are expanded to form an annular collar projecting into the cavity by the respective undercut molding collars, and after the injection curing of the synthetic resin, the upper core is extracted. Companion Via the second slide core and thereby pressurizing element reduced in diameter the first slide core, in which the flange for the undercut and to be displaced from the tubular body inner diameter inward.

In order to achieve the second object, the present invention provides a cavity plate to which a cavity mold is attached, an inner core inserted into and removed from the cavity mold, and a cavity plate in contact with the cavity mold. It is equipped with an undercut molding unit that is fixed to and an upper core that is inserted into and removed from the undercut molding unit.The undercut molding unit has a hole in which the taper part of the upper core can be loosely inserted and from the edge of the hole. A base plate having a plurality of radially extending guide grooves, and a casing having the base plates fitted therein and having spring holes at positions corresponding to the guide grooves on the surrounding wall,
A plurality of holes that have a flange that contacts the top of the casing and a protrusion that fits inside the casing, and a hole that allows the taper part of the upper core to be loosely inserted in the protrusion and that does not match the guide groove of the base plate from the edge of the hole. And a leg plate extending in a radial direction on the base plate between the guide plate of the cover plate and the guide plate of the cover plate, which has a radial guide groove, and which is L-shaped and extends laterally. It has a collar for forming an undercut on the outer surface of the tip and has taper surfaces on both sides in the width direction,
A plurality of first slide cores each having a tapered surface that matches the taper of the upper core on the leg portion on the side opposite the flange, and a side surface L-shaped, and arranged in a guide groove of the base plate so as to be movable in a radial direction;
The leg extending through the hole is wider than the first slide core and has a flange for forming an undercut on the outer surface of the tip of the leg, and the taper surface of the first slide core is in contact with the surface opposite to the flange. The back portion has a plurality of second slide cores biased by a spring from the casing side. The present invention is suitable for molding a stick-shaped cosmetic dispensing container, but is also applicable to molding a cylindrical dispensing container other than cosmetics.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an example of an outer cylinder injection molding apparatus with a full circumference undercut for a lipstick container obtained by applying the present invention.
501 is a spool bush 50 into which an injection nozzle is inserted.
1a is a fixed side mounting plate, 502 is a runner stripper plate, 503 is an upper core stripper plate to which the upper core 1 is fixed, 504 is a fixed side template, 505 is a stripper plate, 506 is a receiving plate, and 507 is a movable side mounting plate. , 508 are the receiving plate 506 and the movable side mounting plate 50.
A spacer block fixed between 7 and 509 is an ejector plate. Reference numeral 601 is a support pin connecting between the spacer block and the fixed side mounting plate 501, 602 is a guide pin reaching the upper core stripper plate 503 from the receiving plate 506, and 603 is a lifter pin extending from the ejector plate 509 and lifting the stripper plate 505. An undercut molding unit 2 and a cavity mold 3 are fitted and fixed to the fixed-side mold plate 504 coaxially with the upper core 1, and a receiving plate 506 is provided in the cavity mold 3.
Further, the inner core 4 extending through the stripper plate 505 is inserted, and the ejector pin 604 is inserted from the ejector plate 509 at the center of the inner core 4. The outer surface of the inner core 4 has a spiral ridge 4 for forming a spiral groove.
1 is provided.

The undercut molding unit 2 is
2 to 4 as a whole, and FIGS. 5 to 19 show the components of the unit, which include a base plate 5, a casing 6, a cover plate 7, a first slide core 8, and a second slide core 8. It has a slide core 9 and a spring 10. The casing 6 has a ring-shaped surrounding wall 60 into which the base plate 5 is fitted, and an inner flange 61 that supports the base plate 5 is formed in a lower portion of the surrounding wall 60. As shown in FIGS. 7 to 9, the base plate 5 has a hole 50 having a diameter larger than that of the tapered portion 11 of the upper core 1 in the center, and a plurality of guide grooves 51 are radially formed from the edge of the hole 50. Has been formed. On the edge of the lower surface of the hole 50, an annular mold surface 52 for molding the outer surface of the upper end edge of the product cylinder A is formed.
In this embodiment, four guide grooves 51 are formed so as to form a cross shape as a whole. And each guide groove 5
1 has a spring 1 on the surrounding wall 60 of the casing 6.
There is a through hole 62 for inserting the plug 0 which inserts 0 and then forms the spring seat.

The cover plate 7 is shown in FIGS. 16 to 18, and the lower surface abuts on the casing 70 and the lower surface abuts on the upper surface of the surrounding wall 60 so that the lower surface abuts on the upper surface of the base plate 5. A flange 72, and a flange 72 having a screw mounting hole 73 that matches the screw hole 63 to be provided in the surrounding wall 60. The screw 75 is screwed in to be integrated with the casing 6. . And the stand 7
0 and a central portion of the flange 72, a hole 74 having a diameter larger than that of the taper portion 11 of the upper core 1 is formed coaxially with the hole 50, and the protrusion 70 has a plurality of holes radially extending from the edge of the hole 74. A book guide groove 71 is formed. The guide grooves 71 are four in this embodiment, and the width is narrower than that of the guide grooves 51 so that the guide grooves 71 are formed in a cross shape and are 45 ° out of phase with the guide grooves 51 of the base plate 5. There is.

First slide core 8 and second slide core 9
2, each of which is slidably arranged in a hole formed by the guide groove 71 of the cover plate 7 and the upper surface of the base plate 5, as shown in FIG. Is slidably arranged in a hole formed by the guide groove 51 and the lower surface of the cover plate protrusion. The first slide core 8 is shown in FIGS. 10 to 12, and the second slide core 9 is shown in a single state in FIGS. 13 to 15, respectively. The bent legs 8b and 9b form an L-shaped side surface. Each of the legs 8b and 9b has such a length that it penetrates through the hole 50 of the base plate 5 and appropriately enters the cavity mold 3 as shown in FIG. First slide core 8
In both the second slide core 9 and the second slide core 9, the back surfaces from the sliding portions 8a and 9a to the leg portions 8b and 9b are bent substantially at right angles,
At the time of retreat, it is positioned so as to abut against the hole wall of the base plate 5 and the base wall surface 50 'on the extension thereof.

A flange 80 for forming an undercut is formed on the outer surface of the tip end of the leg of the first slide core 8. Both sides of the flange 80 in the width direction are cut to form tapered surfaces 81, 8.
It is 1. Then, the leg portion 8 of the first slide core 8
The side opposite to the flange of b is a sloped surface 82 that is inclined outward as it goes upward corresponding to the taper portion 11 of the upper core 1. The sloped surface 82 may be a straight line, but is not curved in the illustration. It is in a state. The second slide core 9 is wider than the first slide core 8 and has a leg portion 8b of the first slide core 8.
It is located radially outwardly. The leg portion 9b has a split circular shape when seen in a plan view, and a flange 90 for forming an undercut is formed on the outer surface of the tip end of the leg portion. The opposite side of the leg 9b is a flat vertical surface 92 extending to the upper end, and when assembled with the first slide core 8, the vertical surface 92 becomes the tapered surface 81 as shown in FIGS. 3 and 4. I have come into contact with them. A bag hole 93 is formed in each of the sliding portions 9a of the second slide core 9, and the spring 10 is inserted into the bag hole 93, and the through hole 62 of the casing 6 is formed.
By pressing the other end with the plug 101 screwed in, each second slide core 9 is pressed toward the inside of the hole 50, whereby two adjacent second slide cores 9 and 9 have vertical surfaces. The leg tapered surfaces 81, 81 of the first slide core 8 are pressed by 92, 92, and the diameters of the first slide core 8 and the second slide core 9 are reduced to project into the holes as shown in FIG. There is.

The base plate 5, the casing 6, the cover plate 7, the first slide core 8, the second slide core 9 and the spring 10 are assembled by fitting the base plate 5 to the casing 6 and appropriately fixing bolts. The cover plate 7 is fixed to the guide grooves 71, 71 with the cover plate 7 turned upside down so that the protrusion 70 faces upward.
Fit the slide cores 8, 8. Then, next, the second slide cores 9, 9 are arranged on the protrusion 70 between the guide grooves, and the taper surfaces 81, 81 of the first slide cores 8 are provided with the vertical surfaces 92 of the second slide cores 9, 9. 92 is brought into contact with each other to reduce the diameter. This state is shown in FIG. Then, next, the assembly of the casing 6 and the base plate 5 is reversed, the guide grooves 51, 51 are aligned with the second slide cores 9, 9, and the casing 6 is fitted onto the protruding base 70.
At this time, the tip ends of the legs of both slide cores 8 and 9 project from the holes 50. After that, the screw 75 is screwed in to integrate the casing 6 and the cover plate 7, then the springs 10 are respectively inserted into the second slide cores 9 from the through holes 62 of the casing 6, the plugs 101 are screwed in, the second slide cores 9, You can urge 9 from behind.

The present invention is not limited to the above embodiment. That is, the base plate 5 may be formed long as shown in FIG. 22 so that it also serves as a cavity type. According to this structure, the number of mold parts is reduced, and since the parting line does not appear on the outer peripheral surface of the product cylinder A, the appearance is improved. In the resin gate as well, in FIG. 1 and FIG. 2, the gate hole 111 is formed in the center of the upper core 1 and the branch passage 211 is formed in the inner core 4 so that the resin is introduced from the inside. However, instead of this,
As shown in FIG. 22, a gate hole 111 and a branch path 112 are bored in a fixed-side mold plate 504 outside the unit to form a cavity mold.
(In this example, the base plate 5) may be connected to the introduction path 212 penetrating the wall thickness. Also, the first slide core 8
The number of the second slide cores 9 may be three or five. Further, the base plate 5 and the casing 6 may be integrally formed without assembling separate parts.

Next, the molding method according to the present invention will be described. At the time of molding, the mold is clamped as shown in FIGS.
In this state, the tapered portion 11 of the upper core 1 penetrates the holes 50 and 74 of the molding unit 2, and the tip end surface of the upper core 4 is the upper surface 4 of the inner core 4.
Close to 0. Since the sloped surfaces 82 of the leg portions 8a of the four first slide cores 8 are in contact with the tapered portions 11, the four first slide cores 8 are pressed in the outer radial direction by the wedge action by the entry of the tapered portions 11 of the upper core 1. In the four first slide cores 8, the tapered surfaces 81, 81 of the leg portions 8b are elastically in contact with the leg vertical surfaces 92 of the second slide core 9 behind, so that the movement of the first slide core 8 causes The slide core 9 is also moved in the outer diameter direction and is in a state of being expanded as shown in FIG. In this state, the collars 80 and 90 formed on the outer sides of the tips of the legs 8b and 9b are connected together,
An annular collar is formed as in. As shown in FIG. 2, the annular brim projects into a cavity C defined by the inner surface of the cavity mold 3, the outer surface of the inner core 4 and the mold surface 52 of the base plate 5.

In this state, an injection nozzle (not shown) is inserted into the spool bush 501a to inject the synthetic resin. The synthetic resin is injected into the cavity from the gate hole 111 through the branch passage 211. This allows the cavity mold 3
The inner surface of the inner core 4 and the outer surface of the inner core 4 form a cylindrical portion a, and the projection 41 on the outer surface of the inner core 4 forms a spiral groove b. With the mold surface 52 of the base plate 5, a short brim-shaped top edge portion d is formed. Thus, when the resin is cured, the fixed-side mounting plate 501 is separated from the runner stripper plate 502 as in the conventional method, then the upper core stripper plate 503 is separated from the fixed-side mold plate 504, and the fixed-side mold plate 504 is separated. Away from 505. When the upper core stripper plate 503 is lifted as shown in FIG. 20, the upper core 1 is moved from the hole 50 of the molding unit 2 into the four first cores.
The inclined surface 82 of the slide core 8 is extracted as a guide. With such movement of the tapered portion 11, the wedge action on the first slide core 8 is weakened, so that the four second slide cores 9 are pushed out in the inner diameter direction by the pressing force of each spring 10, and the second slide cores are pushed out. Vertical plane 9
Since the tapered surfaces 81, 81 of the first slide core 8 are in contact with 2, the four first slide cores 8 are also pressed and moved in the inner diameter direction. As a result, as shown in FIG. 20 and FIG.
The undercut forming collars 80 and 90 of a and 9b are disassembled from the annular state and are narrowed, and all the collars 80 and 90 are displaced inward from the inner surface of the cylindrical portion of the product cylindrical body A, and the holes of the base plate 5 are formed. Located within 50.

With this, the core is released from the undercut of the entire circumference, so if the fixed side mold plate 504 is then separated from the stripper plate 505, the product cylinder A is fitted to the outer periphery of the inner core 4 as shown in FIG. It is left in a closed state. At this time, since the brims 80 and 90 for forming the undercut are located in the holes 50 of the base plate 5, the short brim-shaped top edge portion d of the product tubular body A is not damaged. After that, if the ejector plate 509 is raised, the product cylinder A is demolded. As described above, the cylindrical body A as the stick-shaped cosmetic container made of the constituent resin, which has the entire circumference undercut c below the short brim-shaped top edge portion d, is obtained in one step. After that, a metal-colored coating may be applied to the outer surface of the product cylinder A by vacuum deposition or the like, and a transparent resin coat may be applied. The obtained product is as shown in FIG. 24, which has an appearance as if it was decorated with a metal tube, and the short brim-shaped top edge portion d creates a volume feeling, and a high-class feeling can be exhibited.

[0018]

According to the first aspect of the present invention described above, a cylinder body with an undercut on the entire circumference can be injection-molded in one step without the need for post-processing, and can be used as an outer cylinder of a dispensing container for stick-shaped cosmetics and the like. When applied, it is possible to obtain the excellent effect that the decorative property and the high-class feeling equivalent to the use of the metal cylinder can be exhibited at low cost without using the expensive metal cylinder. Further, according to claim 2 of the present invention, since the entire circumference of the first slide core and the second slide core is narrowed by the action of the spring, and the tapered portion of the core expands the diameter.
It is small and has a simple structure, and the whole mold can be made small even in the case of multi-cavity production.Because the thickness is small, the thickness of the mold can be hardly increased, and it can be used as a base plate. Since the casing and the cover plate form a unit, they can be easily reassembled, and even in the case of a failure, they can be replaced with one touch, which is an excellent effect.

[Brief description of drawings]

FIG. 1 is a cross-sectional view illustrating a molding method and a molding die according to the present invention.

FIG. 2 is a partially enlarged view showing a molding die portion in FIG. 1 in a cross section taken along line XX in FIG.

3 is a partially cutaway bottom view of the molding unit in FIG. 2. FIG.

FIG. 4 is a partially cutaway bottom view showing a state where the core of FIG. 2 is removed.

FIG. 5 is a plan view of a casing according to the present invention.

FIG. 6 is a sectional view of a casing according to the present invention.

FIG. 7 is a plan view of a base plate according to the present invention.

8 is a cross-sectional view taken along the line AA of FIG.

9 is a cross-sectional view taken along the line AB of FIG.

FIG. 10 is a plan view of a first slide core according to the present invention.

FIG. 11 is a sectional view of a first slide core.

FIG. 12 is a perspective view of a first slide core.

FIG. 13 is a plan view of a second slide core according to the present invention.

FIG. 14 is a sectional view of a second slide core.

FIG. 15 is a perspective view of a second slide core.

FIG. 16 is a plan view of a cover plate according to the present invention.

17 is a sectional view taken along the line CC of FIG.

18 is a cross-sectional view taken along the line CD of FIG.

FIG. 19 is a perspective view showing a state during the assembling of the molding unit according to the present invention.

FIG. 20 is a sectional view showing a releasing step in the molding method of the present invention.

FIG. 21 is a cross-sectional view showing a mold release completed state.

FIG. 22 is a sectional view showing another embodiment of the present invention.

FIG. 23 is a perspective view showing the relationship between the upper core and the first and second slide cores of the present invention.

FIG. 24 is a partially cutaway side view illustrating the usage state of the tubular body obtained according to the present invention.

FIG. 25 is a partially cutaway side view of a conventional stick-shaped cosmetic product dispensing container.

FIG. 26 is a partially cutaway side view of a conventional stick-shaped cosmetic product dispensing container.

[Explanation of symbols]

 1 Upper Core 2 Molding Unit 3 Cavity Type 4 Inner Core 5 Units Plate 6 Casing 7 Cover Plate 8 First Slide Core 8b, 9b Leg 9 Second Slide Core 10 Spring 11 Taper 50 Hole 51, 71 Guide Groove 60 Surrounding Wall 70 Collar 72 Flange 80,90 Collar 81,81 Tapered surface for undercut molding

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location // B29C 45/00 7344-4F B29L 22:00 4F

Claims (4)

[Claims] 1. A plurality of first slide cores having undercut molding flanges on the outer peripheral side in a region adjacent to the cavity mold for forming the inside and outside of the cylinder and the core, and a flange for the undercut molding on the outer peripheral side as well. A plurality of second slide cores are alternately arranged in the circumferential direction, the first slide cores are located on the inner diameter side, and the second slide cores are urged from the back by a pressure element to move the second slide cores to the outside of the first slide cores. The first slide core and the second slide core are arranged such that they are always in contact with both sides of the diameter portion, and the upper core is inserted into the first slide core to expand the diameter of the first slide core and the second slide core against the pressing force of the pressure element. An annular collar protruding into the cavity is formed by each undercut molding collar, and after the injection curing of the synthetic resin, the second slide core and the first slide through the second slide core through the pressing element as the upper core is pulled out. Reduced in diameter to Idokoa, molding of the rod-shaped cosmetics feed container, characterized in that the flange for the undercut and to be displaced from the tubular body inner diameter inward. 2. A cavity plate to which a cavity mold is attached, an inner core that is inserted into and removed from the cavity mold, an undercut molding unit that is in contact with the cavity mold and is fixed to the cavity plate, A base plate that has an upper core that is inserted into and removed from the cut molding unit, and the undercut molding unit has a hole into which the tapered portion of the upper core can be loosely inserted and a plurality of guide grooves that radially extend from the edge of the hole. A casing having a hole for inserting a spring in a position corresponding to the guide groove in the surrounding wall and the base plate, and a flange contacting the top of the casing and a protrusion fitting in the casing. A cover plate provided with a hole into which the taper portion of the upper core can be loosely inserted and a plurality of radial guide grooves that do not match the guide grooves of the base plate from the edge of the hole. , A side-L-shaped fitting in the guide groove of the cover plate and movably arranged on the base surface between the guide grooves of the base plate, and a flange for forming an undercut is formed on the outer surface of the tip of the leg extending through the hole. A plurality of first slide cores having tapered surfaces on both sides in the width direction and having tapered surfaces matching the taper of the upper core on the leg portion on the side of the flange, and having a side surface L shape and guiding the base plate A leg portion that is movably arranged in the groove and extends through the hole is wider than the first slide core, and has a flange for forming an undercut on the outer surface of the tip end of the leg portion. The taper surface of the first slide core is in contact with the second slide core, and the back has a plurality of second slide cores biased by the spring from the casing side. Mold. 3. The first slide core and the second slide core are four.
The molding die for a dispensing container for stick-shaped cosmetics or the like according to claim 2, which is a book by book. 4. The molding die for a dispensing container for stick-shaped cosmetics or the like according to claim 1 or 2, wherein the base plate penetrates the casing and also serves as a cavity mold.